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Mapped Datastore : add method on JavaTypeMapping to extract the value for a datastore field

Where we have a mapped datastore, it would be useful if the JavaTypeMapping had a method to return the value that will be put into a particular column ; makes more sense for this to be on the mapping itself than try to do it elsewhere.

Description

Where we have a mapped datastore, it would be useful if the JavaTypeMapping had a method to return the value that will be put into a particular column ; makes more sense for this to be on the mapping itself than try to do it elsewhere.